Nozzle for electric driers



June 12,1928. 1,673,050

w. o. LUM

NOZZLE FOR ELECTRIC DRIERS Filed Dec. 2, 1924 2 Sheets-Sheet 1 INVENTOR 0. [um

ATTORNEY June 12, 1928.

1,673,050 w. o. LUM

NOZZLE FOR ELEEITRIG DRIERS Filed Dec. 2, 1924 2 Sheets-Sheet' 2 INVENTOR %/7fer X 4 /77 ATTORNEY 'by which I am able to units and placing them in the Patented June 12, 1928.

UNITED STATES PATENT OFFICE.

WALTER O. LUM, OF NEW YORK, .N. Y., ASSIGNOR TO BLO-DRY INCORPORATED, OF

I SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

NOZZLE FOR ELECTRIC DRIERS,

Application filed December 2, 1924. Serial No. 753,471.

My invention relates to improvements in construction of nozzles, nozzle guards, and nozzle heater units for electric drying devices. The chief objects of my invention are to create a nozzle for an electric drier which will develop the highest possible mechanical efliciency.

The further object in my'invention is to design an electric heater grid unit, ofthe type which is ordinarily to be inserted in these nozzles, of such construction and mounting that it will provide minimum obstruction in the air passage; that it will contain the greatest possible length of resistor material in the minimum space; that it will be rugged and fireproof, easy to remove and renew or replace; and be simple in construction.

The further object/of my invention is to provide a demountable resistor unit which can be readily positioned in fuse clips and adapt my motor for any voltage. That is to say, that by carrying certain standard windings of resistor readily adapted fuse clips I may use'the same motor on any line voltages encountered and I prefer to mount this variable resistor unit in connection with the general mounting of my nozzle.

-The further object of my inventionlis to provide a nozzle of this type equipped with a suitable guardmounting so that it will not be possible to clog the outlet end of the nozzle by the hands or other objects such as books and also to prevent the nozzle from being easily obstructed by paper wads or rags, and at the same time construct the nozzle guard in such manner that the air stream will not be obstructed; that the guard shall be simple but rugged in design and easily and permanently attached to the nozzle proper without screws.

In order that my invention may be more fully understood reference will now be made to the accompanying drawings in the various figures of which like letters refer to like parts.

Figure 1 is. a diagrammatic wiring diagram showing the electrical wiring in a con-. ventional hot air drier.

Figure 2 is a plan view of the grid resistor unit portion of my device.

Figure 3 is a front elevation of the grid resistor unit portion of my device.

Figure 4 is an end elevation of the grid resistor unit portion of my device.

Figure 5 is an elevation of a section of a typical hot air drying device showing the positioning of my nozzle guard and heat resistor units, a portion of the same being a sectional illustration.

In the drawings similar letters of refer ence denote similar parts in the several views. Referring to Figure 1 the motor armature D is shown connected to the field E. I show my motor resistor unit at C. The ohmic resistance of this unit is varied, depending on the line voltage which is encountered in any particular case and I prefer to make these resistance units in such manner that they maybe mounted in fuse clips .shown in Figure 5 at CC. The fuse clip block BB in Figure 5 being connected to the nozzle by the screws DD. In Figure 1, at B, is shown diagrammatically the con nections of my heating element and the whole circuit is closed by means of the switch A. Referring to the heater unit in Figure 2, I show a plan view of this unit. The terminals K, G are connected when the unit is in place with stationary conductors mounted on the suitable portion of my nozzle proper. The sides J and H of the heater unit slide into the notches or grooves or slots designated Z in Figure 5, so that they may be readily removable and these side portions J and H are connected together by the strip L composed of fibre, mica or other insulating material.

It must be understood that while in my drawings I only show four mica sections I-I any number of such sections may be used. I'also prefer that each end of my mica sections are notched so that they register with corresponding notches in the top and bottom cross supports L. In some cases the side supports in addition to carrying the ordinary terminals KG also carry an extra terminal for connecting the heat resistor unit to the motor. This I do in cases where the motor operates at lower voltage than'the main supplements the motor resistor unit. For example, if the motors are wound standard for 110 volts and it is intended to operate a blower on a 220 volt line, the third terminal on the heat resistor unit is placedmidway of the wiring thus giving approximately 110 volts to the motor.

supply currents and 'notched on the edges at the notches provided in. the topiportion. M

and the entire frame is held together by small rivets Q and the cross .sectionsL are additionally. strengthened by combined rivets and conductor studs- R, theflvarious sections being electrically connectedand the end portions havingan outlet to provideacon nectortothe terminals G and K.

Referring to Figurexia preferredem- Qbodiment shows the top ofniylnozzle case at V fallingdirectly. into the device.

T. witha nozzle guard S. The nozzle guard Sis preferably composed of six radial pieces,

shaped as shown, clarnped on to the top portion T-co1n1ngdown in the center to a central piece to give "rigidity.

ifany obstructing material is placed in the top of the nozzle, such, as a -book- .or hand,

1 .they cannot completely close the samev on my nozzle guards.

account, ofthe shape of AtfU is shownthe inside-of the nozzle and on accountrofthe rough undersurface I provide an :inner inverted-funnel or nozzle cone or inner nozzle Vwhich-centralizes and directs the air stream and enables metoatfect a change in the size of the outletnototherwise changing-the-permanent partsrcof the blower. I also provide the screen TV .to'prevent small pieces-of foreign matter from This screen I i or gridguardis mountedidirectly=over-the lin'it.

heater ;unit as :far from the outside opening The grid guard is constructed as possible.v

0f=l3hlDClg8W1SB strips rather than-round .wirebecauseotthe less resistance offered by :such strip to. the air stream.

areall notched the same ihalf. way through i rugged.

The strips and when assembledm'ake-a very 'At Xis device forming a It will bed/seen that:

thelendfof the blower casting .1 proper and Y showsspaces ,which-qare proseal :for the .blower. E forms the center line oftheblower andF F; :is the bottom of the blower casting while "A A is the outer frame of a typical blower device. It will now be seen that by removing' the outer case A A I can very readily dis-assemble the nozzle motor resistor and heat resistor units and it will also be seen that the construction of the heat resistor unit and its position in the nozzle is so ar ranged, that theair stream has the least possible obstruction.

While I have disclosed one preferred embodiment ofmyinvention, it mustbe understood that other possible arrangements are, within the scope of my invention and claims. Y i

I .Havingthus described my invention what I claim and desire to secureby United States Letters Patent is: i

1. In a nozzle for electricdriers thecoinbination of atop guard on the outer end ofsaid nozzle with an outer closure case an ,inner nozzle cone,. a screen grid guard, an

electric'heating unitadapted to be mounted cross supporting members, a pluralityof intermediate members wound with resistor wire, said insulating side support members I providedwith terminals and all adapted to :beslid'ablymounted in a vertical manner in Rtl the nozzlepassage of. said drying device, all

as and for {the purposes herelnbefore set forth.

:.2..IIl, aI10Z Ale'f0I electric d riersv the combination of atop-guard for the outer end of said nozzle withian .outer closure case, an inner nozzlecone, a screen grid guard, an vvelectric. heatingQunit adapted to be mounted in the nozzle of such driers and consisting of two insulating side support members, two cross supportingmembers, a plurality of intermediate members wound with resistor wire coils said insulating side supporting members provided with terminals and all adaptedfto be slidably mounted in a verti: calama-nner .in the .nozzle passage of said drying device,saidunit also provided with an-electr -icalmotor connecting terminal tap intermediate itsslength.

llntwitness-whereofi Iehave hereto signed my; name this, 19th day of September, 1924. i .MFALTER-O. LUM.

Ice I 

